<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script>
    // 格式化日期 时分秒
    var date = new Date();
    console.log(date.getHours());  // 时
    console.log(date.getMinutes()); // 分
    console.log(date.getSeconds()); // 秒

    // 要求封装一个函数返回当前的时分秒  格式 08:08:08
    function getTimer () {
      var time = new Date();
      var h = time.getHours();
      h = h < 10 ? '0' + h : h;
      var m = time.getMinutes();
      m = m < 10 ? '0' + m : m;
      var s = time.getSeconds();
      s = s < 10 ? '0' + s : s;
      return h + ':' + m + ':' + s;
    }
    console.log(getTimer());
  </script>
</head>

<body>

</body>

</html>